Steam hydraulic press.



L. IVERSEN.

STEAM HYDRAULIC PRESS.

APPLICATION FILED mm: 24. 1912.

Pa tented July 22, 1913.

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my H n hw m STOP 0 ofonsnva g 0 3 2 CD WITNESSES a INVENTOR L. IVERSENQ STEAM HYDRAULIC PRESS.

APPLICATION FILED JUNE 24, 1912. 1,068,243w Patented July .22; 1913.

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23 3g 25 23 J7 18 i 1 ZS Z4 3 y a 3 1'1 a WRTNESSEfi L. IVERSEN. ETEAM HYDRAULIC PRESS.

APPLICATION FILED JUNE 24, 1912.

Patented July 22, 1913.

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INVENTOR L. IVERSEN.

STEAM HYDRAULIC mass.

APPLIGATION FILED JUNE 24, 1912. 1,068,243 Patented July 22, 1913.

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' cally movable press head which UNITED STATES PATENT. OFFICE LoRE'irz IVERSEN, or wEsT HOMESTEAD, PENNSYLVANIA, ASSIGNOR 'IO MESTA MACHINE COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENN SYLVANIA.

STEAM HYDRAULIC PRESS.

of a press embodying myinvention; Fig. 2-

is a detail view of a portion of the valveoperating mechanism; Fig. 3 is a vertical section of the valves and valve operating mechanism; Fig. 4 is a sid'eelevatlon'of a portion of the press; andFig. 5 is a diagrammatic view, illustrating the operation of my invention.

My invention has relation to hydraulic presses, hammers, shears, punches and the like of the typewhich employs steam-hydraulic intensifier apparatus and relates more particularly to the mechanism em- 25 ployed for controlling the operation of the press; the object of my invent-ionbein to provide me of simple and eflicient c aracter operate by the movement of the control lever, whereby the stroke of the press can be automatically controlled.

The nature of my invent-ion will be best understood by reference to the accompanying drawings, in which I have shown'the preferred embodiment ereof and which will now be described, it being premised, however, that various changes may be made in the details of construction and arrange: ment of .the several parts by those skilled in the art, without departing from the spirit and scope of my invention as defined in the appended claims.

In the accompanying drawings, I have shown the invention as applied to a press havin valve mechanism of. the character descri d and claimed in my Patent No. 1,028,356, dated June 4, 1912, but it will be understood that my invention is not limited in its application to that particular press.

In the drawings, the numeral 2 desi nates the bed of the press and 3 the vert1- is arranged to work within the cylinder 4;.

5 designates one of the pull back or lifting cylinders; 6 is the intensifier; and 7 the Specification of Letters Patent.

Application filed .Tune 24, 1912. Serial No. 705,570.

valve 16.

steam rod 8.

9 is the plunger of the press head 3 and 10 designates hydraulic balancing cylinders for the pull back or. lifting cylinders 5, these cylinders 10 havingliquid supply connections 11 with an accumulator 12.

13 designates the supply connection for the-hydraulic cylinder 4, and 14 is a check valve which normally prevents back flow of liquid out of the said cylinder.

l5 designates the steam supply connection for the cylinder 6, said connection bein controlled by a vertically movable admission piston of the intensifier having a 17 the exhaust for the cylinder 6, e011- trolled by the vertically movable exhaust valve 18.

y The parts thus far referred to are wellv known in the art, and form no part of the present invention. 0

. The numeral 19 designates the casing for the control valve, this casing and valve being substantially as shown in my patent above referredjto. The casing is in the form of a cylinder, provided with inlet ports 20 and 21 at different vertical heights which open into a chamber 22, communicating with the steam inlet passage 22. The

casin also has the exhaust into t e exhaust chamber 24:, which communicates with and forms a part of the exhaust passage 17. The casing also has the exaust port- .23 which registers with the steam passage 23 leading to a cylinder-23 whose piston is arranged to control the check valve 14, before referred to.

25 is a bushingwithin the casing 19 having its open upper end communicating directly with the steam inlet passage 15. The bushing has an upper inlet port 26, a lower inlet port 27, an exhaust port 28, and two ports 28 and 28, which are arranged in different positions of the bushing to registerwith the port 23 and passage 23", all as in my said patent. o

The numeral 29 desi ates a reciprocating valve member seate within the bushing 25 and having a downwardly extending stem 30.

In accordance with my present invention, the stem 30 is connected at its lower endto a crank arm 31 on a shaft 32 having another crank arm 33, connected by a link 34 with a port 23 opening Patented July 22, 1913."

connects the sleeve member 40 to a lever arm 42, fixed to a shaft 43 on which is mounted a sheave or pulley 44. A cross belt or cable 45 extends over this wheel or pulley 44 and has its ends connected to the control lever 46 at opposite sides of the fulcrum 47 of said lever. The control lever46 corresponds to the lever 40 of my said patent and has the several positions indicated, respectively, as raising, return stop lowering, stop and forging.

" The movement of the lever 46 to the above indicated posit-ions operates the control valve 29 .and bushing 25 in the manner described in my said patent to efiect the different operations there described.

The numeral 48 designates a link which is connected to the bell crank 35 at its lower end and at its upper end is connected to a crank arm 49 on a shaft 50, having an arm or cam 51 adapted to act on a lever 52. The lever 52 has a lifting engagement with the upwardly extending stem 16 of the intensifier cylinder admission valve '16. The bell crank lever 35 also has a cam 53, which is arranged to act upon a lever 54 having a lifting engagement with the depending stem 18 of the exhaust valve 18.

The general operation of the press is the same as that described in my said patent, being effected by the movement of the control lever 46, but by the provision of the lever 41 and the connections operated thereby, I provide for automatically cutting off the admission steam at any desired point in the movement of the press head 3, and'thus enable the stroke of said head to be auto-. matically regulated. This operation is as follows: Assuming the control lever 46 to be in the stop posit-ion indicated in Fig. 1, it will be readily seen that the downward movement of said lever to a position intermediate the'stop and forging positions will, through the cord or belt 45 and the wheel or pulley 44, effect a movement of the arm 42, to thereby change the position of the pin 39' and also the position of the crank arm 38-. This movement of the crank arm lifts the link 37 and through the bell crank 35, link 48 and the parts operated by said link, opens the admission valve 16 to admit steam to the cylinder 6 above the piston. Referring to the diagram (Fig. 5) the dotted line aa represents the initlal position of the lever 41, corresponding to the position of the parts shown in Fig. 1, and also corresponding to the dotted line position of the lever 46 shown in Fig. 5. When the lever 46 is moved downwardly to the full line position shown in Fig. 5, the lever 41 is moved to the full line position shown in that figure and the valve-operating parts above the lever 41 are shifted from the dotted line position shown to the full line position shown, thereby opening the valve 16, as before stated. Steam being now admitted to the intensifier cylinder 6, the piston 7 makes its downward stroke, carrying with it the inner end of the lever 41. \Vhen said lever assumes the dotted position b-b, the valveactuating parts are shifted back to the dotted line position shown in Fig. 5, thereby closing the valve 16 and shutting off the supply of steam to the intensifier cylinder.

It will be apparent that by varying the exact position to which the lever 46 is moved intermediate the stop and forging positions, and thereby shifting the initial positions of the arm 38 and lever 41, the steam cutoff may be made to occur at any desired point in the stroke of the piston 7. This movement of the lever 46 will, through the link 34, crank arms 31 and 33 and stem 30, effect a slight movement of the valve member 29. This movement will, h o-wever,'be very slight and it will not affect the operative po-sltion of said valve. In other words, said valve is operated by the lever 46 in the same manner as in my patent above referred to and is unaffected by the extent to which the lever 46 is moved between the stop and forging positions, this movement affecting only thepoint at which the cutoff will occur. In my said patent I have fully described the operation of the said valve in its various positions, and reference may be had to that patent for a more complete description of the operation of said valve and of the press as a whole.

The expansion of steam in the intensifier cylinder above, the piston7 after the cutoff occurs will cause a slight further downward movement of said piston sufficient to operate the connections 53 and 54, and there: by open the exhaust valve 18.

My invention provides means of very simple and effective character for automatically regulating the stroke of the press, whereby overrunning is prevented.

- It will be obvious that the invention is not limited in use to the particular valve mechanism which is here shown and described, but that it may be adapted for use with a variety of valve mechanisms.

It will also be obvious that any desired mechanism may be employed for connecting the hand lever 46 with the lever 41 in a manner to provide for the initial adjustments thereof.

tensifier cylinder, a piston therein, an admis sion valve for controlling said' cylinder, a

rock shaft having a movable fulcrum and operatively connected with said valve, hand lever connections for shifting the rock shaft fulcrum, and a member operated by the work stroke of the piston for actuating the rock shaft; substantially as described.

2. A steam-hydraulic presshaving an intensifier cylinder, a piston therein, an admission valve for controlling said cylinder, a hand lever, and actuating connections between the hand lever and the valves, said connections comprising the rock shaft having a floating fulcrum which can be shifted by moving the hand lever, and means actuated by the rod of said piston for actuating said rock shaft; substantially as described.

3. A steam-hydrauliopress having an intensifier cylinder, a piston therein, an admission valve for controlling said cylinder, a rock shaft, actuating connections between said shaft and the valve, said connections comprising a movable fulcrum member, connections between the hand lever and themovable fulcrum member for shifting the position of said member, and a lever con nected with the piston rod of the intensifier cylinder and having a sliding engagement with said fulcrum member; substantially as described.

A. A steam-hydraulic press having an intensifier cylinder, a piston therein, an ad- 7 mission valve for said' cylinder, link and lever mechanism for actuating said valve, a lever arm actuated by the rod of said piston and connected with the link and lever mechanism, and a hand-operatedconnection arranged to shift the point of connection between the lever arm and the link and lever mechanism, whereby the lever arm will actuate said mechanism to close said valve at a point in the stroke of said piston dependent upon the degree of shift of said connection; substantially as described.

5. A steam-hydraulic press having an intensifier cylinder having a piston therein, an admission valve for said cylinder, a movable fulcrum member, actuating connections between said member and the valve, handoperating connections for shifting the position of the movable fulcrum member, and a lever arm connected to the rod of said piston and engaging the fulcrum member; substantially as described.

6. A steam hydraulic press, having anintensifier cylinder, an admission valve cona trolling said cylinder, a piston in said cylinder, a lever operated by the piston, a shiftable fulcrum member carried by said lever, and actuating connections between said member and the said valve, substantially as described.

In testimony whereof, I have hereunto set my hand.

LORENZ IVERSEN,

Witnesses:

J. Tnos. BEALL, Jr, J. It, BERG. 

